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Title: Electron Debye scale Kelvin-Helmholtz instability: Electrostatic particle-in-cell simulations

In this paper, we investigated the electron Debye scale Kelvin-Helmholtz (KH) instability using two-dimensional electrostatic particle-in-cell simulations. We introduced a velocity shear layer with a thickness comparable to the electron Debye length and examined the generation of the KH instability. The KH instability occurs in a similar manner as observed in the KH instabilities in fluid or ion scales producing surface waves and rolled-up vortices. The strength and growth rate of the electron Debye scale KH instability is affected by the structure of the velocity shear layer. The strength depends on the magnitude of the velocity and the growth rate on the velocity gradient of the shear layer. However, the development of the electron Debye scale KH instability is mainly determined by the electric field generated by charge separation. Significant mixing of electrons occurs across the shear layer, and a fraction of electrons can penetrate deeply into the opposite side fairly far from the vortices across the shear layer.
Authors:
; ; ; ; ;  [1]
  1. School of Space Research and Institute of Natural Sciences, Kyung Hee University, Yongin, Gyeonggi (Korea, Republic of)
Publication Date:
OSTI Identifier:
22489918
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPUTERIZED SIMULATION; DEBYE LENGTH; ELECTRIC FIELDS; ELECTRONS; HELMHOLTZ INSTABILITY; SHEAR; TWO-DIMENSIONAL CALCULATIONS; VORTICES; WAVE PROPAGATION